#include <cairo.h>
#include <gtk/gtk.h>


static gboolean
on_expose_event(GtkWidget *widget,
    GdkEventExpose *event,
    gpointer data)
{
  cairo_t *cr;
  cairo_surface_t *surface;
  cairo_set_source_rgb(cr, 0, 0, 0);

  cr = gdk_cairo_create(widget->window);
  surface = cairo_image_surface_create_from_png("omen.png");
  cairo_mask_surface(cr, surface, 0, 0);
  cairo_fill(cr);

  cairo_surface_destroy(surface);
  cairo_destroy(cr);

  return FALSE;
}


int main(int argc, char *argv[])
{
  GtkWidget *window;

  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  g_signal_connect(G_OBJECT(window), "expose-event",
      G_CALLBACK(on_expose_event), NULL);
  g_signal_connect(G_OBJECT(window), "destroy",
      G_CALLBACK(gtk_main_quit), NULL);

  gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
  gtk_window_set_default_size(GTK_WINDOW(window), 305, 100); 

  gtk_window_set_title(GTK_WINDOW(window), "mask");
  gtk_widget_set_app_paintable(window, TRUE);
  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}
